Slow..Rider,

I did the obvious..a goggle search for "Faria Tachometer"..got a bazillion hits. This company makes gauges for mostly marine applications.

Do a search, as gtow69 noted, they very well could have a tech-line. If nothing else, call one of the marine distributors for this item and ask how to hook it up!

http://www.faria-instruments.com/index-new.html

Go to the menu on the left of the page..click on "downloads". Maybe your diaghram is there.

Stuart